900H series
Single Output
DC/DC Converter
F
EATURES
www.martekpower.com
•
6 sided Continuous Shielding
•
Low Output Ripple and Noise
•
Compact 0.4 Inch Profile Package
•
-30
o
C to +75
o
C Operating Temperature Range
0
•
±0
.03% Line/Load Regulation
•
Short Circuit Protection
•
>1,000,000 Hours MTBF
D
ESCRIPTIONS
The 900H series 9 watt, low noise/ripple high density DC/DC
converters offers a wide variety of input voltages in 5, 12, 18,
24, 28 and 48 VDC with high performance output characteris-
tics. The low profile modular case (2.0” X 2.0” X 0.4”) makes
the 900H series attractive for printed circuit board mounting
applications for I/O computer subsystems, instruments,
telecommunication equipment, medical and analog networks
where low noise output and excellent line and load regula-
tion is required.
I
NPUT
C
HARACTERISTICS
Min Typ Max Unit/Comments
Input Voltage @ FL
5 VDC Input Models
12 VDC Input Models
18 VDC Input Models
24 VDC Input Models
28 VDC Input Models
48 VDC Input Models
Input Fuse Requirements
5 VDC Input Models
12 VDC Input Models
18 VDC Input Models
24 VDC Input Models
28 VDC Input Models
48 VDC Input Models
Reverse Polarity Input
Current
Input Filter
4.65
10.9
16.4
21.6
25.2
43.2
5
12
18
24
28
48
4000
2000
1500
1000
1000
500
5
5.25
13.2
19.8
26.4
30.8
52.8
VDC
VDC
VDC
VDC
VDC
VDC
mA; Slow blow type
mA; Slow blow type
mA; Slow blow type
mA; Slow blow type
mA; Slow blow type
mA; Slow blow type
Amp
Pi Filter
O
UTPUT
C
HARACTERISTICS
Output Voltage Set Point
Line Regulation
Min Typ Max Unit/Comments
±0.5 ±1.0 % Output voltage at
nominal line & FL
±0.03 % Output voltage
measured from
min. input line to
maximum
±0.03 % Output voltage
measured from FL
to 10% load
10 mV p-p, Nom.Line
@FL, 20MHz B.W.,
using 1
μf
bypass
capacitor
Limited,
Automatic Recovery
±5 % deviation of Vout
for a 25% load change
20
μS
for 25% load
change, to within 1%
±0.01 % per
o
C
Load Regulation
Ripple/Noise
G
ENERAL
C
HARACTERISTICS
Switching Frequency
Isolation Voltage
Isolation Resistance
Isolation Capacitance
MTBF (MIL-HBK-217F)
Min Typ Max Unit/Comments
kHz
125
VDC, 1 minute
500
Mohm, 500VDC
1000
pF, 100kHz, 1Volt
100
Million Hours,
1
+25
o
C, Ground
Benign
Short Circuit Protection
Transient Response
Deviation
Transient Recovery Time
Temperature Coefficient
Martek Power reserves the right to change specifications without notice.
B-66
E
NVIRONMENTAL
S
PECIFICATIONS
Operating Temp. Range
Storage Temp. Range
Relative Humidity
Cooling
Min
-30
-40
Typ Max
+75
+125
+95
Unit/Comments
o
C; Ambient
o
C
% Humidity; non-
condensing
Free-Air Convection
P
HYSICAL
C
HARACTERISTICS
Case Size
Case Material
Shield Connection
Flammability
Weight
Unit/Comments
2.0 X 2.0 X 0.4 inches
(51.0 X 51.0 X 10.2 mm)
Painted Metal with Non-
Conductive Base
Output Return (Pin 5)
UL94V-0
74 Grams
O
UTLINE
D
RAWING
2.00 (50.8)
0.40
(10.2)
0.40
(10.2)
0.60
(15.2)
3
+Vout
4
NC
5
-Vout
0.040±.005
(1.01)
DIA.
2.00
0.80 (50.8)
(20.3)
BOTTOM
+Vin -Vin
1
2
SIDE
0.60
(15.2)
0.90
(22.9)
0.22
(5.6)
0.40
(10.2)
0.20
(5.1)
P
IN
O
UT
C
HART
Pins
1
2
3
4
5
NC = No Connection
Single
+ Vin
- Vin
+ Vout
N/C
- Vout
Notes:
1. Unless otherwise specified dimensions are in inches (mm).
Tolerances
Inches
mm
X.XX = ±0.02
X.X = ±0.5
X.XXX= ±0.010
X.XX = ±0.25
All specifications are typical at nominal input, nominal load and 25
°
C unless otherwise specified.
External, low ESR, 10 microfarad (minimum) capacitor across output is recommended for operation.
B-67
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